Frost was letting out pleased grunts as the contractions wracked her huge form, the entirely mountain rumbling as the miracle of birth was happening. After weeks of gestation, it was done. She could feel Flurry's new egg pulsing inside of her, begging to be reborn. She'd felt him feeding from her, her godlike body providing the lesser drake with sustenance, and now he was ready to reemerge, stronger than ever.
A grand roar echoed across the mountain range as Frost finally pushed out her egg, taking deep breaths to steady herself. The birth hadn't really worn her out, as an ascended primordial dragon such mortal struggles could never exhaust her. Instead she was quelling her anticipation, more than eager to witness Flurry's new form and its meaning for the dragonkind. Never before had a Primordial Dragon reproduced. Even in their glory days the titans of dragonkind had been distant gods to their kin, unreachable from more than just their size. But here stood the exception that would reshape this world: a gigantic egg, easily the size of an ancient dragon, carved with draconic runes and pulsating a soft, blue light as the being within slumbered, eager to break free.
Frost gave the egg an affectionate lick, her motherly instinct imprinting upon it immediately. She could taste her power radiating from it, could sense the changed dragon within. The time was now. The next step in their evolution was as hand.
"Hear my call!" She roared.
"The worthless wyrm, previously called Flurry. I have mothered you anew, and you have partook of my essence, ascending within my divinity to grace this world once more. Now, awaken! Awaken to face the future of our species! Awaken to be its progenitor! Awaken, to herald a new age alongside me..."
Her voice echoed in the lair, bombarding the egg as large crack began to glow along its surface, the newborn dragon within struggling free.
"...Squall, Daughter of Frost, Goddess of Dragons!"
Frost finished her chant just as the egg burst open with a massive burst of supercooled air. Had the temperature already not been at absolute zero, it would've plummeted even further, the laws of reality struggling to comprehend the emerge of this new being, the offspring of a goddess.
Frost gazed upon her daughter as she gasped for aim amidst the shards of her egg. Now free of the prison, the newborn dragon could finally stretch out, presenting herself to her mother.
Obvious changes aside, Squall was BIG. While barely even half the size of Frost, she easily eclipsed all but the oldest of Ancient Dragons. Her size was further boosted by Flurry's change of gender, Frost's influence overriding the previous makeup of the weaker male to turn him into a larger, more ferocious female. Her heaving form was clad in the same diamond-like scales as her mother, and similar icicle spines adorned her back and replaced her horns.
However, difference arose once you looked further down. Squall's chest was adorned with three pairs of heaving mammaries, huge feminine breasts pushing out of her to present faucet-like dark blue scaled nipples, already squirting out gallons of cool milk. Frost's evolution of the dragon race included her own mammalian endowments, having deemed them necessary for raising stronger young. Her offspring would be monotremes, distancing themselves as a new, superior dragon species.
Nestled underneath her breasts was her stomach, a rounded dome occupied by a cavernous womb line with four pairs of ovaries, cementing itself as a biological egg factory. Squall was constantly in heat, always ovulating, perpetually ready to produce more and more dragons in larger and larger quantities. Frost was pleased to realize that her daughter by her lonesome could outbreed the entire existing dragon population in a matter of decades, so strong were the reproductive powers of her line. Her omnivorous womb would accept any seed, producing brand new draconic species just to sate her ever-growing hunger for offspring. She would become a broodqueen to end all broodqueens.
With a roar, Squall spread out her wings, naturally grown to support her larger frame. She hadn't inherited the four wings of her mother, but Frost noted that her new wings possessed vestigial hands at their tips, making Squall somewhat of a dragon-wyvern hybrid, a trait that would surely reinforce itself as she bred and spread her line.
Squall's roar unleashed her breath weapon, razor-sharp icicles emerging from her maw and flying for hundreds of meters, pelting the walls of her lair with an icy forest of destruction. Frost felt proud witnessing the abilities of her daughter. She didn't seem to possess her perfect control of the cold, but her icy breath was clearly adapted to be cold enough to freeze the very oxygen in the air to create a ceaseless barrage of projectiles. Any creature foolish enough to assault her nest would be met with a furious retaliation burst, if Squall's overtuned protective instincts wouldn't compel her to burst through even solid permafrost to maul the interlopers to death first.
As she stood there in all her magnificence, Frost could help but roar alongside her, expressing pure joy at the creation of her breeder. Her daughter. Her single most valuable ally in recreating the dragon race.
"Squall, my darling, how do you feel?" Frost asked once they both finally calmed down.
Now that she had recovered from the rapture of her birth, Squall was clearly shaking, nervous twitches enveloping her form.
"M-M-M-Mother. I n-n-n-need seed. I must breed. Eggs. I-I-I-" she struggled out, her huge womanhood opening and closing like a flower of frost, her mammaries leaking milk that immediately froze into blinding white spires of draconic goodness. Frost smiled.
"Worry not, my daughter. Mommy will help you."